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J & S

Muscles (skull, facial, vertebral) & Actions

QuestionAction
Rectus capitis posterior major Extends & rotates head
Rectus capitis posterior minor Extends head
Obliquus capitis inferior Rotates atlas
Obliquus capitis superior Extends & bends head laterally
Splenius cervicis Unilaterally (extend & hyperextend head & neck) Bilaterally (laterally flex, rotate head & neck)
Spinalis Extends vertebral column
Longissimus Extends, rotates head, Lateral flexes, extends vertebral column, Rotates ribs for forceful inspiration
Iliocostalis Extension, lateral flexion of vertebral column, Rotates ribs for forceful inspiration
Depressor anguli oris Depresses corner of mouth
Depressor labii inferiorus Depresses lower lip
Serratus posterior superior Raises ribs for inspiration
Serratus posterior inferior Pulls ribs down, resists pull of diaphragm
Occipitalis (Epicranius) Draws back scalp, Wrinkles forehead, Raises eyebrows
Frontalis (Epicranius) Draws back scalp, Wrinkles forehead, Raises eyebrows
Orbicularis oris Closure & protrusion of lips
Orbicularis oculi Closes eyelids
Platysma Depresses & draws lower lip laterally, Tightens skin of neck, Depresses mandible
Buccinator Compresses cheek
Longus capitis Unilaterally (rotate head) Bilaterally (flex head)
Longus colli Flex cervical vertebrae
Mentalis Elevates & protrudes lower lip (pouts)
Corrugator Draws eyebrows toward nose
Risorius Retracts angle of mouth (grinning)
Levator labii superioris elevates upper lip “elvis”
Levator anguli oris Depresses angle of mouth (frowning)
Temporomandibular Joint (TMJ) Elevation, depression, side-side, protraction, retraction
Created by: rock-steady
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